Nonpoint Source Stream Reach Assessment Form 



STREAM NAME AND COUNTY_ 



GENERAL ASSESSMENT PARAMETERS CONTINUED... 



6. CHANNEL STABILITY : (CHANSTAB) CONSIDER SHIFTS IN SUBSTRATE MATERIAL (I.E. SCOURING, DEPOSITION, POOL FILLING). 



SCOURING AND DEPOSITION 

 NONE OR MINOR, BARS STABLE AND WELL VEGETATED 

 (<5X AFFECTED BY EITHER PROCESS). 

 SOME SCOUR AT CONSTRICTIONS OR STEEP GRADES, 

 AND/OR POINT BAR ENLARGEMENT BY COURSE GRAVEL. 

 (5-JOX AFFECTED). 



MODERATE SCOUR AND/OR DEPOSITION, POINT BARS 

 ENLARGING BY GRAVEL AND SAND AND SOME NEU BARS 

 FORMING. (J1-50X AFFECTED). 



SEVERE SCOUR AND/OR DEPOSITION OCCURS IN MOST 

 AREAS OF THE STREAM. NEU BAR DEVELOPEMENT BY 

 FINE MATERIAL IS COMMON. (>30X OF THE CHANNEL 

 IS IN THE STATE OF FLUCTUATION) 

 [NOTE: "NEW DEPOSITINAL MATERIAL SHOULD BE 

 CLEAN (LIGHTER COLORED), LOOSE AND UNVEGETATED] 



POOL DEVELOPMENT 

 POOLS COMMON AND/OR 

 WELL DEVELOPED. 

 MINOR POOL FILLING, 

 MOSTLY BY SILT. 

 POOL SIZE DECREASING 

 DUE TO FILLING. 

 POOLS SEVERELY 

 REDUCED OR LACKING 

 DUE TO FILLING. 



CHANNEL CAPACITY 

 , CHANNEL CONTAINS PEAK FLOUS PLUS 



MORE IF NECESSARY (U-D >7) 

 , CHANNEL CONTAINS HOST PEEK FLOUS 



{U-0-8 TO 15) 

 . CHANNEL BARELY CONTAINS PEAK FLOUS 



(U-D-16 TO 25) 

 , CHANNEL CAPACITY GENERALLY 



INADEQUATE FOR PEAK FLOW. 



OVERBANK FLOUS COMMON (U-D»25) 



STREAMSIDE VEGETATION : (STRVEG) CONSIDER VEGETATION ON BOTH BANKS, UITHIN 100" OF ACTIVE (SCOURED) CHANNEL. 

 BRIEFLY DESCRIBE THE STREAMSIDE VEG. COMMUNITY (I.E. DOMINANT SPP., AGE, WIDTH, ETC.) 



VEGETATIVE BANK STABILITY: ABILITY OF SANK VEG. TO RESIST EROS. GOOD FAIR POOR 



PERCENT BARE GROUND: AMOUNT OF BARE GROUND (EXPOSED MINERAL SOIL) U/IN VEG. ZONE <15X 15-30X 31-45X ^>45X 



AVERAGE WIDTH OF VEGETATIVE ZONE; >100' 76-100' 51-75' 25-50' <25' 



ESTIMATE MINIMUM UIOTH ' AND MAXIMUM WIDTH ' 



USE AND/OH DAMAGE: CONSIDER NATURAL (I.E. UINDTHROU, DEAD TREES ETC.) OR HUMAN FACTORS (I.E. GRAZING, LOGGING ETC). 



PLEASE ELABORATE* BY DESCRIBING TYPE OF USE OR DAMAGE OBSERVED. 

 NONE OR MINOR MODERATE SUBSTANTIAL SEVERE 



STREAK SHADING: CONSIDER HOU MUCH OF THE STREAM IS SHADED BY BANK VEGETATION. 

 >75X 51-75X 25-50X <25X 



SEDIMENT FILTERING CAPACITY CONSIDER FACTORS SUCH AS SLOPE AND SEDIMENT SOURCES 

 ^GOOO FAIR POOR 



CHANNEL HOOIFIERS : (CHANMDF) CONSIDER NATURAL AND ARTIFICIAL MATERIALS AND/OR STRUCTURES (IE. ANY MATERIAL OR STRUCTURE 

 THAT HAS FALLEN IN OR BEEN PLACED IN THE STREAM CHANNEL). EXAMPLES OF MODIFIERS ARE BRIDGES, CULVERTS, DEBRIS JAMS, BEAVER 

 DAMS, CAR BODIES, RIP-RAP ETC... [PLEASE ELABORATE] 

 STRUCTURES/MATERIALS STABLE AND IMPROVING STREAM CONDITION (EX. SED. TRAP, FISH HABITAT, BANK STABILITY.) 



OR OTHERUISE NOT CAUSING FISH PASSAGE OR STABILITY PROBLEMS. 



STRUCTURES/MATERIALS GENERALLY STABLE EXCEPT DURING FLOODS; REUTEO STABILITY PROBLEMS MINOR. 



STRUCTURES/MATERIALS HAVE GOOD POTENTIAL TO BE MOVED UITH HIGH TO MODERATE FLOUS. THESE FEATURES MAY RELEASE SEDIMENT 



INTO THE SYSTEM AND/OR CAUSE BANK OR CHANNEL EROSION. 

 STRUCTURES/MATERIALS UNSTABLE AND/OR CAUSING SEVERE BANK OR CHANNEL EROSION. 



DESCRIBE THE MATERIALS OR STRUCTURES THAT MAY BE MODIFYING THE CHANNEL. 



DESCRIBE ANY POSITIVE CONTRIBUTIONS THAT MODIFIERS ARE MAKING TO THE STREAM (EX. fISH COVER, STABLE SED. TRAPS, BANK 

 STABILIZATION ETC.) 



DESCRIBE ANY NEGATIVE CONTRIBUTIONS THAT MODIFIERS ARE MAKING TO THE STREAM ( EX . BANK/CHANNEL EROSION, FISH BARRIERS, 

 UNSTABLE SEDIMENT TRAPS, ETC) 



Flathead Basin Cooperative Program Final Report 



Page 209 



